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Wyniki wyszukiwania dla: ELECTROENCEPHALOGRAPHY

Wyniki wyszukiwania dla: ELECTROENCEPHALOGRAPHY

  • CLINICAL ELECTROENCEPHALOGRAPHY

    Czasopisma

    ISSN: 0009-9155

  • Assessment of Therapeutic Progress After Acquired Brain Injury Employing Electroencephalography and Autoencoder Neural Networks

    Publikacja

    A method developed for parametrization of EEG signals gathered from participants with acquired brain injuries is shown. Signals were recorded during therapeutic session consisting of a series of computer assisted exercises. Data acquisition was performed in a neurorehabilitation center located in Poland. The presented method may be used for comparing the performance of subjects with acquired brain injuries (ABI) who are involved...

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  • Assessment of hearing in coma patients employing auditory brainstem response, electroencephalography, and eye-gaze-tracking

    The results of the study conducted by Tagliaferri et al. in 12 European countries indicate that the ratio of registered brain injury cases in Europe amounts to 150-300 per 100 000 people, with the European mean value of 235 cases per 100 000 people. The project presented in the paper assumes development of a combined metric of patients’ state remaining in coma by intelligent fusion of GCS (subjective Glasgow Coma Scale or its derivatives)...

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  • Balance recognition on the basis of EEG measurement.

    Although electroencephalography (EEG) is not typically used for verifying the sense of balance, it can be used for analysing cortical signals responsible for this phenomenon. Simple balance tasks can be proposed as a good indicator of whether the sense of balance is acting more or less actively. This article presents preliminary results for the potential of using EEG to balance sensing....

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  • A Computationally Efficient Model for Predicting Successful Memory Encoding Using Machine-Learning-based EEG Channel Selection

    Publikacja
    • K. Saboo
    • Y. Varatharajah
    • B. Berry
    • M. Sperling
    • R. Gorniak
    • K. Davis
    • B. Jobst
    • R. Gross
    • B. Lega
    • S. Sheth... i 4 innych

    - IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE - 2019

    Computational cost is an important consideration for memory encoding prediction models that use data from dozens of implanted electrodes. We propose a method to reduce computational expense by selecting a subset of all the electrodes to build the prediction model. The electrodes were selected based on their likelihood of measuring brain activity useful for predicting memory encoding better than chance (in terms of AUC). A logistic...

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  • Network oscillations modulate interictal epileptiform spike rate during human memory

    Publikacja
    • J. Matsumoto
    • M. Stead
    • M. Kucewicz
    • A. Matsumoto
    • P. Peters
    • B. Brinkmann
    • J. Danstrom
    • S. Goerss
    • W. Marsh
    • F. Meyer
    • G. Worrell

    - Brain: A Journal of Neurology - 2013

    Eleven patients being evaluated with intracranial electroencephalography for medically resistant temporal lobe epilepsy participated in a visual recognition memory task. Interictal epileptiform spikes were manually marked and their rate of occurrence compared between baseline and three 2 s periods spanning a 6 s viewing period. During successful, but not unsuccessful, encoding of the images there was a significant reduction in...

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  • Interictal high-frequency oscillations in focal human epilepsy

    Publikacja

    - CURRENT OPINION IN NEUROLOGY - 2016

    PURPOSE OF REVIEW: Localization of focal epileptic brain is critical for successful epilepsy surgery and focal brain stimulation. Despite significant progress, roughly half of all patients undergoing focal surgical resection, and most patients receiving focal electrical stimulation, are not seizure free. There is intense interest in high-frequency oscillations (HFOs) recorded with intracranial electroencephalography as potential...

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  • Daytime Acute Non-Visual Alerting Response in Brain Activity Occurs as a Result of Short- and Long-Wavelengths of Light

    Publikacja
    • K. Łaszewska
    • G. Agnieszka
    • P. Weber
    • T. Pracki
    • M. Tafil-Klawe
    • D. Pracka
    • P. Złomańczuk

    - JOURNAL OF PSYCHOPHYSIOLOGY - 2018

    Very recent preliminary findings concerning the alerting capacities of light stimulus with long-wavelengths suggest the existence of neural pathways other than melatonin suppression that trigger the nonvisual response. Though the nonvisual effects of light during the daytime have not been investigated thoroughly, they are definitely worth investigating. The purpose of the present study is to enrich existing evidence by describing...

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  • Reactivation of seizure‐related changes to interictal spike shape and synchrony during postseizure sleep in patients

    Publikacja
    • M. Bower
    • M. Kucewicz
    • E. St. Louis
    • F. Meyer
    • W. Marsh
    • M. Stead
    • G. Worrell

    - EPILEPSIA - 2017

    OBJECTIVE: Local field potentials (LFPs) arise from synchronous activation of millions of neurons, producing seemingly consistent waveform shapes and relative synchrony across electrodes. Interictal spikes (IISs) are LFPs associated with epilepsy that are commonly used to guide surgical resection. Recently, changes in neuronal firing patterns observed in the minutes preceding seizure onset were found to be reactivated during postseizure...

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  • Self diagnostics using smart glasses - preliminary study

    n this preliminary study we analyzed the possibility of the reliable measurement of biomedical signals with some potential hardware extensions of smart glasses. Using specially designed experimental prototypes four category of biomedical signals were measured: electrocardiograms, electromyograms, electroencephalograms and respiration waveforms. Experi- ments with volunteers proved that using even simple construc- tion of sensors...

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  • Direct brain stimulation modulates encoding states and memory performance in humans

    Publikacja
    • Y. Ezzyat
    • J. Kragel
    • J. Burke
    • D. Levy
    • A. Lyalenko
    • P. Wanda
    • L. O'Sullivan
    • K. Hurley
    • S. Busygin
    • I. Pedisich... i 16 innych

    - CURRENT BIOLOGY - 2017

    People often forget information because they fail to effectively encode it. Here, we test the hypothesis that targeted electrical stimulation can modulate neural encoding states and subsequent memory outcomes. Using recordings from neurosurgical epilepsy patients with intracranially implanted electrodes, we trained multivariate classifiers to discriminate spectral activity during learning that predicted remembering from forgetting,...

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  • Behavioral state classification in epileptic brain using intracranial electrophysiology

    Publikacja
    • V. Kremen
    • J. Duque
    • B. Brinkmann
    • B. Berry
    • M. Kucewicz
    • F. Khadjevand
    • J. Van Gompel
    • M. Stead
    • E. St.louis
    • G. Worrell

    - Journal of Neural Engineering - 2017

    OBJECTIVE: Automated behavioral state classification can benefit next generation implantable epilepsy devices. In this study we explored the feasibility of automated awake (AW) and slow wave sleep (SWS) classification using wide bandwidth intracranial EEG (iEEG) in patients undergoing evaluation for epilepsy surgery. APPROACH: Data from seven patients (age [Formula: see text], 4 women) who underwent intracranial depth electrode...

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  • Gamma oscillations precede interictal epileptiform spikes in the seizure onset zone

    Publikacja
    • L. Ren
    • M. Kucewicz
    • J. Cymbalnik
    • J. Matsumoto
    • B. Brinkmann
    • W. Hu
    • W. Marsh
    • F. Meyer
    • S. Stead
    • G. Worrell

    - NEUROLOGY - 2015

    OBJECTIVE: To investigate the generation, spectral characteristics, and potential clinical significance of brain activity preceding interictal epileptiform spike discharges (IEDs) recorded with intracranial EEG. METHODS: Seventeen adult patients with drug-resistant temporal lobe epilepsy were implanted with intracranial electrodes as part of their evaluation for epilepsy surgery. IEDs detected on clinical macro- and research microelectrodes...

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  • Ripple oscillations in the left temporal neocortex are associated with impaired verbal episodic memory encoding

    Publikacja
    • Z. Waldman
    • L. Camarillo-Rodriguez
    • I. Chervenova
    • B. Berry
    • S. Shimamoto
    • B. Elahian
    • M. Kucewicz
    • C. Ganne
    • X. He
    • L. Davis... i 17 innych

    - EPILEPSY & BEHAVIOR - 2018

    BACKGROUND: We sought to determine if ripple oscillations (80-120 Hz), detected in intracranial electroencephalogram (iEEG) recordings of patients with epilepsy, correlate with an enhancement or disruption of verbal episodic memory encoding. METHODS: We defined ripple and spike events in depth iEEG recordings during list learning in 107 patients with focal epilepsy. We used logistic regression models (LRMs) to investigate the...

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  • Special techniques and future perspectives: Simultaneous macro- and micro-electrode recordings

    Publikacja

    - 2019

    There are many approaches to studying the inner workings of the brain and its highly interconnected circuits. One can look at the global activity in different brain structures using non-invasive technologies like positron emission tomography (PET) or functional magnetic resonance imaging (fMRI), which measure physiological changes, e.g. in the glucose uptake or blood flow. These can be very effectively used to localize active patches...

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  • Electrical Stimulation Modulates High Gamma Activity and Human Memory Performance

    Publikacja

    - eNeuro - 2018

    Direct electrical stimulation of the brain has emerged as a powerful treatment for multiple neurological diseases, and as a potential technique to enhance human cognition. Despite its application in a range of brain disorders, it remains unclear how stimulation of discrete brain areas affects memory performance and the underlying electrophysiological activities. Here, we investigated the effect of direct electrical stimulation...

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  • Human verbal memory encoding is hierarchically distributed in a continuous processing stream

    Publikacja
    • M. Kucewicz
    • K. Saboo
    • B. Berry
    • V. Kremen
    • L. Miller
    • F. Khadjevand
    • C. Inman
    • P. Wanda
    • M. Sperling
    • R. Gorniak... i 8 innych

    - eNeuro - 2019

    Processing of memory is supported by coordinated activity in a network of sensory, association, and motor brain regions. It remains a major challenge to determine where memory is encoded for later retrieval. Here we used direct intracranial brain recordings from epilepsy patients performing free recall tasks to determine the temporal pattern and anatomical distribution of verbal memory encoding across the entire human cortex. High...

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  • High frequency oscillations are associated with cognitive processing in human recognition memory

    Publikacja
    • M. Kucewicz
    • J. Cymbalnik
    • J. Matsumoto
    • B. Brinkmann
    • M. Bower
    • V. Vasoli
    • V. Sulc
    • F. Meyer
    • W. Marsh
    • S. Stead
    • G. Worrell

    - Brain: A Journal of Neurology - 2014

    High frequency oscillations are associated with normal brain function, but also increasingly recognized as potential biomarkers of the epileptogenic brain. Their role in human cognition has been predominantly studied in classical gamma frequencies (30-100 Hz), which reflect neuronal network coordination involved in attention, learning and memory. Invasive brain recordings in animals and humans demonstrate that physiological oscillations...

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  • Pathological brain network activity: memory impairment in epilepsy

    Publikacja

    - NEUROLOGY - 2013

    Our thinking, memory and cognition in general, relies upon precisely timed interactions among neurons forming brain networks that support cognitive processes. The surgical evaluation of drug-resistant epilepsy using intracranial electrodes provides a unique opportunity to record directly from human brain and to investigate the coordinated activity of cognitive networks. In this issue of Neurology®, Kleen and colleagues1 implicate...

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  • Human memory enhancement through electrical stimulation in the temporal cortex

    Publikacja
    • M. Kucewicz
    • B. Berry
    • L. Miller
    • F. Khadjevand
    • Y. Ezzyat
    • J. Stein
    • V. Kremen
    • B. Brinkmann
    • P. Wanda
    • M. Sperling... i 10 innych

    - Brain: A Journal of Neurology - 2018

    Direct electrical stimulation of the human brain can elicit sensory and motor perceptions as well as recall of memories. Stimulating higher order association areas of the lateral temporal cortex in particular was reported to activate visual and auditory memory representations of past experiences (Penfield and Perot, 1963). We hypothesized that this effect could be used to modulate memory processing. Recent attempts at memory enhancement...

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  • Widespread theta synchrony and high-frequency desynchronization underlies enhanced cognition

    Publikacja
    • E. Solomon
    • J. Kragiel
    • M. Sperling
    • A. Sharan
    • G. Worrell
    • M. Kucewicz
    • C. Inman
    • B. Lega
    • K. Davis
    • J. Stein... i 5 innych

    - Nature Communications - 2017

    The idea that synchronous neural activity underlies cognition has driven an extensive body of research in human and animal neuroscience. Yet, insufficient data on intracranial electrical connectivity has precluded a direct test of this hypothesis in a whole-brain setting. Through the lens of memory encoding and retrieval processes, we construct whole-brain connectivity maps of fast gamma (30-100 Hz) and slow theta (3-8 Hz) spectral...

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  • Pathological and physiological high-frequency oscillations in focal human epilepsy

    Publikacja
    • A. Matsumoto
    • B. Brinkmann
    • S. Stead
    • J. Matsumoto
    • M. Kucewicz
    • W. Marsh
    • F. Meyer
    • G. Worrell

    - JOURNAL OF NEUROPHYSIOLOGY - 2013

    High-frequency oscillations (HFO; gamma: 40-100 Hz, ripples: 100-200 Hz, and fast ripples: 250-500 Hz) have been widely studied in health and disease. These phenomena may serve as biomarkers for epileptic brain; however, a means of differentiating between pathological and normal physiological HFO is essential. We categorized task-induced physiological HFO during periods of HFO induced by a visual or motor task by measuring frequency,...

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  • Dissecting gamma frequency activities during human memory processing

    Publikacja
    • M. Kucewicz
    • B. Berry
    • V. Kremen
    • B. Brinkmann
    • M. Sperling
    • B. Jobst
    • R. Gross
    • B. Lega
    • S. Sheth
    • J. Stein... i 6 innych

    - Brain: A Journal of Neurology - 2017

    Gamma frequency activity (30-150 Hz) is induced in cognitive tasks and is thought to reflect underlying neural processes. Gamma frequency activity can be recorded directly from the human brain using intracranial electrodes implanted in patients undergoing treatment for drug-resistant epilepsy. Previous studies have independently explored narrowband oscillations in the local field potential and broadband power increases. It is not...

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  • Unsupervised machine-learning classification of electrophysiologically active electrodes during human cognitive task performance

    Publikacja
    • K. Saboo
    • Y. Varatharajah
    • B. Berry
    • V. Kremen
    • M. Sperling
    • K. Davis
    • B. Jobst
    • R. Gross
    • B. Lega
    • S. Sheth... i 3 innych

    - Scientific Reports - 2019

    Identification of active electrodes that record task-relevant neurophysiological activity is needed for clinical and industrial applications as well as for investigating brain functions. We developed an unsupervised, fully automated approach to classify active electrodes showing event-related intracranial EEG (iEEG) responses from 115 patients performing a free recall verbal memory task. Our approach employed new interpretable...

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